Synthesis and characterization of waterborne polyurethane dispersion from glycolyzed products of waste polyethylene terephthalate used as soft and hard segment |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;2. Carpoly Chemical Group Co. Ltd., Jiangmen 529085, Guangdong, China;1. Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, S/N, Niterói 24210-346, RJ, Brazil;2. Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói 24020-141, RJ, Brazil;3. CENPES – Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, Petrobras. Av. Horácio Macedo 950, Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-915, RJ, Brazil;1. Faculty of Technology, University of Ni?, Leskovac, Serbia;2. Faculty of Technology, University of Novi Sad, Serbia;3. Vin?a Institute of Nuclear Sciences, University of Belgrade, Serbia;1. Chemical Engineering Programme, Faculty of Engineering, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia;2. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;3. Higher Institution Centre of Excellence Wood and Tropical Fibre (HICoE), Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;4. Radiation Processing Technology Division, Malaysian Nuclear Agency, 43000 Kajang, Selangor, Malaysia;5. Department of Chemistry, Faculty of Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;6. School of Engineering Technology, Universiti Kuala Lumpur, Malaysian Institute of Chemical and Bioengineering Technology (UniKL MICET), Taboh Naning, 78000 Alor Gajah, Melaka, Malaysia;1. Department of Polymer & Surface Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga (E), Mumbai, 400019, India;2. Radiation Technology Development Division, Bhabha Atomic Research Centre, Department of Atomic Energy, Government of India, Mumbai 400085, India |
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| Abstract: | Waste polyethylene terephthalate (PET) bottles were collected, cleaned and then depolymerized by glycolysis with neopentyl glycol (NPG) and dipropylene glycol (DPG), in the presence of N-butyl titanate catalyst. The product, named glycolyzed oligoesters, obtained through the depolymerization, were employed respectively in hard segment and soft segment in the synthesis of novel waterborne polyurethane dispersions (PUDs) via a simple and environmentally benign process. In addition, a polyurethane dispersion without glycolyzed oligoesters was synthesized as a comparison. The bulk structure of PET glycolyzed oligoesters and PUDs films were characterized by Fourier transform infrared spectroscopy (FT-IR), H-nuclear magnetic resonance (1H NMR) and Gel permeation chromatography (GPC). The results illustrated that glycolyzed oligoesters were successfully introduced into the hard and soft segment of the polyurethanes. Furthermore, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to investigate the thermal properties of the PET glycolyzed oligoesters and PUDs films. The results showed that the thermal resistance of waterborne polyurethanes obtained with glycolyzed oligoesters increased due to lower degrees of phase separation. X-ray diffraction indicated that all synthesized polyurethanes exhibited reduced degrees of orientation. Due to the balance between hard-/soft-segment of the waterborne polyurethane dispersions, the formulations containing glycolyzed oligoesters within the hard segment sections of the polyurethanes provided the best performance. |
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| Keywords: | PET waste Glycolyzed oligoesters Waterborne polyurethanes Soft segment Hard segment |
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